Materials Literature
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The kinetics of two-dimensional isothermal domain growth in a quenched ferroelectric system is investigated using Monte Carlo simulation based on a realistic Ginzburg-Landau ferroelectric model with cubic-tetragonal (square-rectangle) phase transitions. The evolution of the domain pattern and domain size with annealin…
The present study compares the feasibility of controlling the properties of a glass composite seal by adding nano‐ or micron‐scale yttria‐stabilized zirconia (YSZ) powders to a borate glass used for sealing electrolyte‐supported solid oxide fuel cells (SOFCs). The crystallization of the glass composites was found to b…
We report the fabrication of a novel carbon structure consisting of uniform carbon nanotubes formed in the nanochannels of anodic aluminum oxide (AAO) templates, with the surface side open and connected by a uniform carbon sheet. The uniformity of the fabricated CNT arrays, plus the carbon film on the AAO surface inte…
We have developed techniques for the introduction of reactive functional groups to nylon surfaces via site-specific reactions targeting at the naturally abundant amide repeating units on the surface. In this report, we describe the fabrication of nylon-supported composite surfaces using the most efficient modification…
Wahlweise nass oder trocken! Wolframoxidfilme, die durch einfache elektrochemische Abscheidung erhältlich sind, sind die ersten Beispiele für eine duale Oberflächenfunktionalität. Das reversible Schalten der Benetzbarkeit zwischen Superhydrophobie und Superhydrophilie gelingt durch den Wechsel zwischen Bestrahlung mit…
First-principles calculations based on the density functional theory and the generalized gradient approximation were carried out to systematically investigate the optical properties of $\mathrm{B}{\mathrm{C}}_{2}\mathrm{N}$ nanotubes. Two types of zigzag nanotubes and two types of armchair nanotubes were considered. I…
To study the change of interlayer structure of a Wyoming-type Na-montmorillonite as a result of the replacement of interlayer Na+ ions by cetylpyridinium (CP+) ions, a series of NPT Monte Carlo simulations of the clay mineral with different contents of CP+, Na+, Cl- ions and water in its interlayer space is carried ou…
We have designed and fabricated a subwavelength grating (SWG) broadband mirror whose performance depends on key factors, including SWG period, duty cycle, and angle of incident light. The fabricated SWGs exhibit high reflectivity (⩾96%), when the grating periods are varied from 650to750nm and duty cycles are varied fr…
We report on enhanced light extraction from a light-emitting device based on amorphous silicon nanoclusters, suitable for very-large-scale integration, and operating at room temperature. Standard low-cost optical lithography is employed to fabricate a two-dimensional photonic crystal onto the device. We measured a ver…
We investigate the effect of the casting solvent on the phase behavior of a cylinder-forming poly(styrene-b-isoprene) (PS-b-PI) diblock copolymer mixed with marginally selective gamma-Fe2O3 nanoparticles. Notably, for the mixtures of PS-b-PI/gamma-Fe2O3 nanoparticles cast with toluene, which is a neutral solvent for b…
Luminescent colloidal silicon particles are obtained by burning silane and slowly etching the product with hydrogen fluoride. Depending on their size, the particles emit red-orange or blue-green light with decay times between 28 micros and <0.1 micros, respectively. The quantum yield of the red luminescence is found t…
A series of dendritic core-shell structural polymers with different shell densities were synthesized based on dendritic polyester Boltorn H40 and were demonstrated to form unimolecular micelles in chloroform. The encapsulation mechanism study using Congo red as a guest molecule by fluorescence and UV-vis methods showe…
Complex wurtzite ZnSe microspheres with hierarchical fractal structure and showing strong quantum-size effects can be prepared easily by a mild solvothermal reaction in a diethylenetriamine (DETA)-deionized water (DIW) binary solution. The ZnSe microspheres are made up of nanosheets, each formed by the face-to-face pa…
The fluorescent properties of a new 1,3,5-cyclohexyltricarboxamide-based low-molecular-weight hydrogelator (1) derivatized with one hydrophobic fluorophore and two hydrophilic substituents have been investigated. Gels of 1 are composed of long, nonbranched fibers of uniform diameter, as shown by cryo-transmission elec…
In the colossal magnetoresistance manganites polarons have been proposed as the charge carrier state which localizes across the metal-insulator transition. The character of the polarons is still under debate. We present an assessment of measurements which identify polarons in the metallic state of ${\mathrm{La}}_{2∕3}…
The elastic deformation behaviors of perfect $\mathrm{NiAl}$ and $\mathrm{FeAl}$ are investigated using an ab initio electronic structure total energy method. The calculated ideal shear strengths for the ${112}⟨111⟩$ and ${110}⟨111⟩$ slip show qualitatively different features between the two intermetallics. In $\mathr…
In order to determine the local structure of Mn in $\ensuremath{\delta}$-doped GaAs layers we have carried out an x-ray absorption spectroscopy experiment at the Mn-K edge in samples grown by molecular beam epitaxy with and without Be co-doping. Mn-Mn atomic correlations have not been found within $\ensuremath{\sim}5\…
Solid‐state reactions have the potential for direct preparation of ceramic powders and offer a low‐temperature and low‐cost alternative to conventional techniques for production of oxide powders. This paper describes a simple and effective mechanochemical method based on solid‐state reactions during ball milling for s…
A new lattice gas model has been developed, describing the hydrogen storage in hydride-forming materials. This model is based on the mean-field theory and Bragg-Williams approximation. To describe first-order phase transitions and two-phase coexistence regions, a binary alloy approach has been adopted. A complete set…
Starre und stabförmige helicale Polyacetylen-Moleküle ordnen sich in Gegenwart von Lösungsmitteldämpfen hierarchisch auf Graphit an. Eine Monoschicht aus flach auf der Graphitoberfläche aufliegenden Polyacetylen-Molekülen dient als Fundament für helicale Polyacetylen-Moleküle, die chirale 2D-Bündel mit bestimmter Heli…